remove V8_USE_UNSAFE_HANDLES define

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 202 matching lines @@
 };
 
 // --- Handles ---
 
 #define TYPE_CHECK(T, S)                                       \
   while (false) {                                              \
     *(static_cast<T* volatile*>(0)) = static_cast<S*>(0);      \
   }
 
 
-#define V8_USE_UNSAFE_HANDLES
-
 /**
  * An object reference managed by the v8 garbage collector.
  *
  * All objects returned from v8 have to be tracked by the garbage
  * collector so that it knows that the objects are still alive.  Also,
  * because the garbage collector may move objects, it is unsafe to
  * point directly to an object.  Instead, all objects are stored in
  * handles which are known by the garbage collector and updated
  * whenever an object moves.  Handles should always be passed by value
  * (except in cases like out-parameters) and they should never be
@@ skipping 6132 matching lines @@
 
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_